Recuperative furnace



H. B. DEMPSEY.-

RECUPERATIVE FURNAUt.

APPLICATION man Nov.5.192o.

aeuted 9st, l, 2 SHEETS-SHEET l ENTOR m ATTORNEY H. B. DEMPSEY. RECUPERATIVE FURNACE. .APPLICATION FILED Nov. 5.

l Patented Oct 3, 1922.

2 SHHTSASHEIT Z.

if 73 l(ICNDVENTOR l BY I l, l {Le} v n. "W"- ATTORNEY ramas oa. 3, 1922.

UNITED STATES. PATENT QFFCE.

HARRY B. DEMISEY, F NEW' YORK, lil. Y.

. RECUPERATIVE FURNACE.

Application filed November 5, 1920. Serial No. 421,375.

To c25 whom it mary concern:

Be it known that l, HARRY B. Dlmrsnr, a` citizen of the United States, and a resident of New York city, in the count of New York and State of New York, lieve invented certain new and useful Improvements in Reeuperative Furnaces, of which the following is a specilication.`

lily invention relates to apparatus for reclaiming heat from the waste gases yof industrial heating furnaces, gas retorts, etc., the function ci the apparatus being to transer a large 'percentage of heat contained in tie 'lue gases to the fuel combustion air, thereby conserving fuel, promoting combustion, and making possible the use of fuels of low heat value. a l

The primary object of this invention is to provide a recuperator of such structural torni that will eliminate the leakage of comloustion air trom air passages to Hue gas passages, and also of such form that will secure thegreatest possible contact between the air andthe surfaces heated by the wastey gases. x

ii further object is to simplify the componentparts of the reeuperator and to `reduce manufacturing and construction costs.

ln the accompanying drawings, Fig. 1 is a vertical longitudinal section on the line lci Fig. 2, of a billet heating furnace embodying the invention; Fig. 2 is a cross Vsection of the same taken on the line 2--2 of l; Fig. 3 is a perspective viewrof a flue tile utilized in my construction of recuperator; Fig. 4 is a perspective view of the parte of a modified construction of the same; 5 is aperspective view of a. lockjoint tile utilized by me in connection with the tiles of the character shown in Figs. 3 or e, in building. up my new recuperator; and Fig. 6 a perspective View of the assembled reouperator. v

'ln the drawings I have shown my irn proveniente as applied to a billet heating furnace, out it is understood that my invention is not restricted to employment in connection. with any particular type of fur nace, it being applicable to any forni where it is desirable or necessary to heat the combustion air.

ln the form shown, 1 designates the com bustion ports and 2 the heating chamber. The waste combustion gases pass downward through ues 3 to chamber 4 and thence to flue 5,

and from flue 5 the gases enter a.

series of lues o1 conduits (i, passing thence to flue 7 and returning through fines 8 where access is-had to stack line 9.

Air is admitted to due 10 which extends the full lengt-l1 ot' recuperator, and contains passageways to *dues il. The air passes hack and forth through fines 1l in the ldirections indicated by arrows, and enters flue l2. From Hue Vl2 the air in a highly heated state finds its way into uptakes lli and passes into and interlningles with the fuel in the comn bustion ports l,

During the sojourn of waste comicos tion gases through the system of iines 6 and 8, a large percentage of the heat contained inv same is absorbed by the containii'ig walls, and then imparted to the air currents in dues 1l. The air ilows in counter direction to the Waste combustion gases and leaves the recuperator at its hottest part, thus receiving the maximum prehea't.

The recuperator is composed of tubular blocks 9.() (Fig. 3) and lock 'joint tiles 22 (Fig. 5) and said blocks 20 areormed with flanges or tongues 2 at both ends in two opposite sides. The tubular blocks are laid end to end and side -liy side forming rows of extended llues. The of blocks are built in tiersand are separated, one tier from the other, oy means of the lock *joint tiles 22. The lspaces loetween'each tier forni another system of dues at right angles to the first. The lock joint tiles in addition forming separators for the tubular blocks serve to lock the tubular blocks together so v that the joints cannot separate due to vibration or expansion and contraction. The blocks 20 and tiles 22. all being commonly known as tiles, are preferably made lof re frartory material, but any other stiltable material may be employed. As shown in Figs. 5 and 6 the tiles 22 are formed in their upper and lower faces with 'longitudinal grooves 23 adaptel to receive the abutting flanges on adjacentends of the blocks 20. The flues 6 and 8. are preferably used for the waste gases, and fines 11 for the combustion air, but this whole position may be reversed and lues 6 and 8 used for ,the combustion air and flues 1l for wastegases.

The accompanying drawings show the recuperator located under the furnace hearth, but it may be placed at any other convenient place, depending upon the furnace design and conditions of' installation.

The blocks 20 instead of being in one in.

ice

'tegral piece`r may be formed of, two matchinterlocking sections 24. :25. as indicated in Fig. 1.

The surlaee of the bore in the tubular blocks 20 may contain lugs. ribs or corrugations, shouldvsnch features add to the efficiencyof -the recuperator.

In the above description I have shown a recinierator built up ot a system ot' parallel tlnes through which the waste products of combustion are allowed to circulate on their way to the atmosphere. and another system of fines at right angles to the first system in which the air currents circulate. The tiles are of such Jform that they will be locked together in a manner that 'will 'insure the whole mass expanding and contracting together as a unit. thus making possible permanently tight joints and overcoming'objections in other forms ot' recuperators.

YWhat l claim as my invention and desire `to'secure by Letters Patent. is:

l. recuperator o1" the vcharacter described composed of two systems of alternating tiers of blocks and each system comprising in each tier a plurality of parallel rows of horizontally disposed blocks, the blocks of one system being tubular and in the layers thereof arranged in side by side and end to end abutting relation and formed integrally at the ends ot' their upper and lower sides with oppositey projecting flanges. and the blocks of the other or second system being solid and arranged in rows at right angles to the. blocks of the first system and in end to end abutting relation and spaced-apart side relation and formed with upper and lower grooves snugly receiving and interlocking with the end fianges on the blocks of the first system7 the grooves in the intermediate 40 blocks ol the second system being adapted to receive the contiguous flanges of the adjacent abutting ends ot' the blocks of the first system.

Q. A reeuperator of the character scribed composed of two systems ot' alternating tiers of blocks and each system comprising in each tier a plurality of parallel rows of horizontally disposed blocks. the blocks ot' one system being tubular and in the lay- 50 ersl thereof arranged in side by side and end to end abutting relation and formed integrally on their abutting ends with oppositely projecting flanges, and the blocks ot' the other or second system being solid and ar- 55 serving to create flnes between them and (i5 also to couple together the adjoining ot the adjacent tubular blocks ot' the system.

Signed at New York city,

ends first in the county of New York and State of New York, this 4th 70 `day of' November. A. D. 1920.

HAR RY B. DEMPS [C Y.

de w

formed with longitudinal GQ 

